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✔ Meets/Exceeds: DIN 912 ✔ Material of Screws: 12.9 grade alloy steel, hardness: HRC 39-44, tensile strength: 1220N/mm² ✔ Rust proof for Screws : black oxide finish, covered with anti-rust oil ✔ Material of Hex Key Wrench: chrome-vanadium steel, nickel plated ✔ Easy to store: these screws and hex key wrench come in an easy-use storage case Item---------------Thread Length--------Total Length M3 x20mm-----------20mm----------------23mm M3 x25mm-----------25mm----------------28mm M3 x30mm-----------30mm----------------33mm M3 x35mm-----------35mm----------------38mm M3 x40mm-----------40mm----------------43mm Package Contains: M3 x20mm---------20Pcs M3 x25mm---------20Pcs M3 x30mm---------20Pcs M3 x35mm---------20Pcs M3 x40mm---------20Pcs Hex Key -------1 Pcs Total: 101 Pcs Hex Socket Drives: Hex socket hex drives, also known as Internal Hex Drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrench Socket Cap Head: Socket Cap Head ,also known as Allen head ,have a recessed drive, and are commonly used when there is not enough clearance for a conventional wrench or socket. They are fastened with an Allen wrench, which is also called a hex wrench or hex key.